diff --git a/lua/frecency/tests/sorter_spec.lua b/lua/frecency/tests/sorter_spec.lua
new file mode 100644
index 0000000..2f38c0e
--- /dev/null
+++ b/lua/frecency/tests/sorter_spec.lua
@@ -0,0 +1,89 @@
+local Default = require "frecency.sorter.default"
+local Opened = require "frecency.sorter.opened"
+local SameRepo = require "frecency.sorter.same_repo"
+
+---@param text string
+local function parse_text(text)
+  local entries = {}
+  for line in vim.gsplit(text, "\n", { plain = true, trimempty = true }) do
+    local part = vim.split(line, "%s+", { trimempty = true })
+    if #part == 2 then
+      table.insert(entries, { score = tonumber(part[1]), path = part[2] })
+    end
+  end
+  assert(#entries > 0)
+  return entries
+end
+
+local entries = [[
+   10  /path/to/project_A/style.css
+   20  /path/to/project_B/main.c
+   40  /path/to/project_C/lib/main.ts
+   60  /path/to/project_A/image.jpg
+   80  /path/to/project_B/Makefile
+  100  /path/to/project_A/index.html
+]]
+
+describe("frecency.sorter", function()
+  for _, c in ipairs {
+    {
+      M = Default,
+      name = "Default",
+      entries = [[
+        100  /path/to/project_A/index.html
+         80  /path/to/project_B/Makefile
+         60  /path/to/project_A/image.jpg
+         40  /path/to/project_C/lib/main.ts
+         20  /path/to/project_B/main.c
+         10  /path/to/project_A/style.css
+      ]],
+    },
+    {
+      M = Opened,
+      name = "Opened",
+      entries = [[
+         80  /path/to/project_B/Makefile
+         60  /path/to/project_A/image.jpg
+        100  /path/to/project_A/index.html
+         40  /path/to/project_C/lib/main.ts
+         20  /path/to/project_B/main.c
+         10  /path/to/project_A/style.css
+      ]],
+    },
+    {
+      M = SameRepo,
+      name = "SameRepo",
+      entries = [[
+        100  /path/to/project_A/index.html
+         80  /path/to/project_B/Makefile
+         60  /path/to/project_A/image.jpg
+         20  /path/to/project_B/main.c
+         10  /path/to/project_A/style.css
+         40  /path/to/project_C/lib/main.ts
+      ]],
+    },
+  } do
+    it(("%s sorter returns valid entries"):format(c.name), function()
+      local originals = {
+        nvim_list_bufs = vim.api.nvim_list_bufs,
+        nvim_buf_get_name = vim.api.nvim_buf_get_name,
+        root = vim.fs.root,
+      }
+      vim.api.nvim_list_bufs = function()
+        return { 1, 2 }
+      end
+      vim.api.nvim_buf_get_name = function(bufnr)
+        return ({ "/path/to/project_A/image.jpg", "/path/to/project_B/Makefile" })[bufnr]
+      end
+      vim.fs.root = function(path, _)
+        local repo = path:match "(.*project_.)"
+        return repo
+      end
+      local sorter = c.M.new()
+      assert.are.same(parse_text(c.entries), sorter:sort(parse_text(entries)))
+      vim.api.nvim_list_bufs = originals.nvim_list_bufs
+      vim.api.nvim_buf_get_name = originals.nvim_buf_get_name
+      vim.fs.root = originals.root
+    end)
+  end
+end)